Thermal diffusion coupling mechanism and its application of discrete waveguide

For discrete optical systems integrated into fibers, the fields of individual waveguides are coupled and correlated with each other. This paper investigates how refractive index can be tuned by thermal diffusion to enhance coupling between waveguides. In this paper, waveguide thermally diffused model twin-core three-core fibers constructed. The multicore fiber is heated a hydrogen-oxygen flame for different times, outgoing light field at end face monitored same time. Then, three-dimensional measurement results verify feasibility technology change coupling. Thermal used fabricate couplers. Combined core-by-core inscribed Bragg gratings technology, single-channel sensing realized technology. method changing through has advantages high integration, stability, mass fabrication. research on improve application potential systems, promote broad structure in communication, sensing, biomedicine, artificial intelligence.